Piston pin



Nov. 21, 1933. H Y 1,936,158

PISTON PIN Filed June 30, 1930 INVENTOR Harold 1. 55/62".

Patented Nov. 21, 1933 PISTON, PIN

Harold I. Dyer, Detroit, Mich., assignor to Wilcox- Rich Corporation, acorporation of Michigan Application June 30, 1930. Serial No. 464,747

4 Claims.

Although referred to simply as a piston pin, the present inventionshould be understood to include a novel method of forming piston pins,or like articles, from three pieces of sheet metal,two 5 of said piecesbeing oppositely concave and ordinarily semi-cylindrical in form, and athird piece (flat and having a lesser diameter) being employed as areinforcing partition extending longitudinallyof the completed pin.

Wrist pins for pistons having heretofore commonly been formedfrom-expensive bar stocks and reduced in weight by boring and reamingoperations which are wasteful of metal as well I as of power and timeand attention, it is an 5 object of the present invention to providelight but strong piston pins from a suitable sheet metal. It is aspecial object of the present invention economically to provide a pistonpin with an internal reinforcing web extending longitudinally thereofand adapted to be disposed in the plane of the maximum pressure to whichsaid pin is subjected, said webs or partitions or other parts of thenovel pins may be terminally so shaped as K to cooperate with usual orspecial pin-retaining devices, of any appropriate character, insubstantially preventing longitudinal or rotative movement of said pinswithin pistons; and said partitioning webs may, to facilitate suchcooperation and/or a welding in a preferred manner hereinafterdescribed, initially have a dimension or dimensions slightly greaterthan the corresponding dimension or dimensions of the wall members ofthe finished pin.

Other objects of the present invention may be best appreciated from thefollowing description of an illustrative embodiment thereof, taken inconnection with the appended claims and the accompanying drawing.

, Fig. 1 is a perspective view of one type of pin 40 illustrative of thepresent invention.

Fig. 2 is an end elevational View showing diagrammatically the assemblyof two oppositely concave and substantially semi-cylindrical members andan intermediate partitioning member, these being all formed from sheetstock.

Fig. 3 is a diagrammatic view taken similarly to Fig. 2 but illustrativeof a preferred technique of uniting the mentioned members.

. Fig. 4 is a perspective longitudinal sectional view through a pistonin which a pin illustrative of the present invention is so secured as todispose the mentioned reinforcing partition in a plane of maximumcompressive effect during use thereof.

Fig. 5 is a detail view pertinent to a use rather than to the structureof the novel pin and taken as indicated by the arrow 5 of Fig. 4,merelyto show one type of clip available to secure a piston pin illustrativeof the present invention in suitable bearing bosses provided in pistons.

Fig. 6 is a view similar to Fig. 2, but showing flat blanks, assumed tobe substantially rectangular in outline and to be properly proportionedbut to have received no curvature.

Fig. 7 is a view introduced for purposes of com- 5 parison, showing inlongitudinal section a prior art pin.

Referring first to the more general features shown in Fig. 4, a pin P isshown as extending through bosses B of a piston and also through abearing in a connecting rod R; but the specific character of said pistonand said rod, as also the specific character of any keeper organization,employed to limit or prevent longitudinal or r0- tative movement of pinsP within the bearings B, may be regarded as comparatively immaterial tothe present invention in pin construction.

Although Fig. 6 shows a presumably rectanguiar or slightly trapezoidalblank 10, adapted to be employed as a partitioning or reinforcing eleg0ment, as disposed between wider blanks 11 and 12, adapted to serve aswall blanks when suitably curved and placed, it will be obvious thatconfigurations such as are indicated in Fig. 2 may be imparted to saidblank either simultaneously 35 with or subsequently to an initialblanking operation. As suggested in Fig. 3, either or both of thesemi-cylindrical members 11, 12 may then be disposed in edge to edgerelationship with the partitioning member 10; and, although union mightbe effected by alternative means, the illustration suggests union of thementioned edges by the passing of an electric current therethrough whileeffecting a movement of approach between said partitioning element,which may serve as an intermediate electrode, and one or both of a pairof relatively movable pressure-applying electrodes 13, 14. In favor ofthis method, it may be noted that the external periphery of the members11 and 12 after a semi-cylindrical form has been imparted thereto, andthe provision of comparatively sharp edges at 15, 15' and 16, 16, may befavorable not only to the development of a high temperature, due to thelimited contact and consequent high resistance along said edges, but tothe, single-operation formation of substantially cylindrical or slightlyoversize pins upon the advance of the members 11 and 12 from suchpositions as those in which said members are shown in full lines in Fig.3 to such positions as are indicated in dotted lines; and the flow ofmetal at said edges may be such as to produce not only the mentionedexternal form but an inward flow of metal, adjacent said edges,substantially as indicated at 1'? in Figs. 1 and 3.

It will be obvious not only that any desired grinding finishing, platingand/or other perfecting steps may be'applied to pins produced from threepieces of sheet metal in substantially the described manner, and it willbe understood that the new pin P may be used in substantially the samemanner as a pin P of the general character illustrated in Fig. '7 butthat the formation of a tapered or cylindrical bore 21 in pins of thelatter character is an expensive and wasteful operation; and that,because pins of the type last referred to are unprovided with means toprevent rotation thereof, the disposition and quantity of metal thereinmust provide for a safety factor not required in novel pins P, providedthe latter be used in conjunction with some means, such as shownin Figs.4 and 5, serving to hold the reinforcing partitions 10 in a longitudinaldiametrical plane common to the pin P and the piston receiving the same.In this connection, and merely for the sake of completeness, atransverse slot or groove 22 is shown as receiving a key 23, adapted toenter slots left at one end of a short portion member 10; and a splitring 24 is shown as so entering a peripheral slot 25 as to retain saidkey,but these features will be understood to be of subordinate interestherein, being elsewhere described and claimed.

Although the foregoing description has included complete details of butone embodiment of the present invention, it should be understood notonly that various features thereof might be independently employed butalso that numerous modifications, additional to any suggested herein,might easily be devised by skilled workers, if informed of theforegoing-all without departure from the scope of the present invention,as

the latter is indicated above and in the following claims.

I claim:

1. A method of producing reinforced cylindrical articles from separatepieces of sheet metal which comprises, disposing curved outside piecesin edge to edge alignment against a partition, providing inwardlysloping edges on said outside pieces, and welding said pieces by meltingsaid sloping edges which forms a shoulder with the partition inwardly ofthe outer surface of the finished article.

2. A method of producing reinforced articles of piston pin type fromseparate pieces of sheet metal which comprises, disposing curved outsidepieces in edge to edge alignment against a partition, providing inwardlysloping edges on said outside pieces, and uniting said pieces when soaligned by passing a current through mutually contacting edges thereof.

3. A method of producing reinforced articles of piston pin type fromseparate pieces of sheet metal which comprises, disposing curved outsidepieces in edge to edge alignment against an inner partition, providinginwardly sloping edges on said outside pieces, and uniting said pieceswhen so aligned by passing a current through mutually contacting edgesthereof while effecting a movement of approach between said pieces.

4. A method of producing reinforced cylindrical articles from separatepieces of metal which comprises, disposing oppositely curved outsidepieces in edge to edge alignment against a partition piece, providinginwardly sloping edges to said outside pieces and simultaneously unitingsuch curved pieces to said partition when so aligned by passing acurrent through mutually cont sting edges thereof while oppositelyadvancing said outside pieces in relation to said partition to formshoulders with the partition inwardly of the outer surface of thefinished article.

HAROLD I. DYER.

